But now it seems that as well as releasing new music (out this Friday, May 31), she is also trying out new hair, posting some wild apricot locks on her Instagram on May 28.
Here we take a look at the best of Katy Perry's other hair hits.
On April 20, 2019, Katy Perry debuted new hair on her Instagram: gorgeous shoulder length blonde locks, the first time in a while that she has gone for longer hair.
Only a few days before she had a blonde pixie cut when she performed at Coachella with Zedd.
Back in 2017, Katy shocked all when she went short with a blonde pixie cut.
She told Ellen DeGeneres that she had to chop her hair because over-bleaching was causing Katy's longer locks to fall out, similar to when Lady Gaga said she had to have a "chemical haircut" back in 2011 because of her dyed blond hair.
But sitting down with Viceland series The Therapist, Katy gave more reasons for the chopped look.
"I'm really strong as Katy Perry and then sometimes I'm not as strong as Katheryn Hudson," she said. "People like to talk about my hair, right? They don't like it or they wish that it was longer. I so badly want to be Katheryn Hudson that I don't even want to look like Katy Perry anymore sometimes. And that is a little bit of why I cut my hair is because I really want to be my authentic self, like 100%."
Although some fans compared Katy Perry's short hair to that of Miley Cyrus and Justin Bieber and commented how much they preferred it long, others welcomed the new look and praised her for her bravery.
Although Katy's signature hair colour is jet black, judging by her baby pictures her natural hair colour would seem to be brown.
Speaking to Glamour, she revealed the reason for her many hairstyles: "I'm naturally the most boring dishwater squirrel brown. So I've been playing with colors since I was 15. I loved the grunge green, and shocking blue was fun. Colored hair is such a huge accessory that you don't even need to add extra stuff."
All the colours of the rainbow!
Resembling her hairstyle in the "California Gurls" music video, Katy decided to go for bright blue hair and a fringe at the MTV Movie Awards in California on June 6, 2010.
A rosy hue was Katy’s choice of hair for the 2011 MTV Europe Music Awards.
For the 2012 Echo Awards, Katy went for a unique hairstyle and a turquoise dye.
Making an appearance on The Tonight Show with Jay Leno in 2012, Katy Perry went for the colour purple.
Who is cuter? Katy Perry in Feb. 2014 with short black hair and fringe ... or one of the world's most famous pets, @jiffpom?
In April 2014, Katy went “slime green for spring,” keeping her black roots and fringe but adding a pop of sludge for the rest.
Green plait buns with slicked back hair in June 2014.
Embracing an indigo hue - and a Britney-JT flashback - in August 2014.
How about a burgundy bob? December 2014.
The singer attended the 57th GRAMMY Awards in February 2015 with lavender hair to complement her outfit.
Katy decided to change up her look in September 2015, showcasing fiery red hair at the Harper ICONS Party.
Katy went for a sophisticated black bob for the 8th Annual GO Campaign Gala in November 2015.
No, seriously, all-the-colours-of-the-rainbow hair in December 2015 - and the perfect match for that fairy outfit.
Her iconic long black hair perfectly compliments her fair skin and light eyes in January 2016.
Looking white hot with a lob (long bob) in February 2017.
Katy Perry sported a tousled blonde do to the 59th GRAMMY Awards in February 2017.
Long blonde French plait braids are well suited to the caption “Katy Kardashian” in April 2017.
Who knew a streak of bright blue through the middle of a grey pixie cut could look so good? (June 2017)
Inspired by the cherry blossoms she came across on the Asian leg of "Witness: the Tour”, Katy decided to turn her hair cherry pink in April 2018.
A bright lavender pixie chop, paired with the caption “call me the purple Teletubby ok 💜" in May 2018.
Spicing up her short hair with a fluro green look, showing that having less hair doesn’t mean any less possibilities for different looks. (September 2018)
The classic: platinum blonde pixie cut. (October 2018)
Growing pains: on American Idol in April this year, Katy Perry featured a tousled platinum blonde bob ...
... and fluro pink (with matching eyeshadow!)
Most recently, Katy looked gorgeous with long blonde hair and many fans thought so too.
Catch Katy Perry's new video, here.